package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response =(HttpServletResponse) servletResponse;
        //1.获取本次请求
        String requestURI = request.getRequestURI();
        log.info("拦截到本次请求：{}",requestURI);
        //定义不需要处理的请求
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",//静态资源加载
                "/front/**",
                "/common/**",
                "/user/login",//客户端登录
                "/user/sendMsg"//客户端获取验证码
        };
        //2.判断本次请求是否需要进行处理
        boolean check = check(urls,requestURI);
        //3.如果不需要处理，直接放行
        if (check){
            log.info("本次请求：{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4-1.判断登录状态，如果已登录，直接放行
        if (request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，id为：{}",request.getSession().getAttribute("employee"));

           // 将登录用户的id存储到ThreadLocal中
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }
        //4-2.判断登录状态，如果已登录，直接放行(客户端用户登录验证)
        if (request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，id为：{}",request.getSession().getAttribute("user"));
            Long userId =(Long) request.getSession().getAttribute("user");
            //将登录用户的id存储到ThreadLocal中
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);//????
            return;
        }
        log.info("用户未登录");
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOT LOGIN")));
        return;
    }
    //路径匹配，检查本次请求是否需要放行
    private boolean check(String[] urls, String requestURI) {
        //遍历放行路径
        for (String url : urls) {
            //比较前端发出的请求路径是否在放行路径中
            //如果在就返回true，否则返回false
            boolean result = PATH_MATCHER.match(url, requestURI);
            if (result){
                return true;
            }
        }
        return false;
    }
}
